![]() BRT6 method is attached to IGPU device but there can be a 2nd BRT6 method under GFX0 (or whatever other name) if the laptop is fitted with a dGPU too.To successfully apply the required SSDT patch, given that a little tuning may be required depending on the target platform, it's most useful to understand that brightness keys of Dell laptops usually operate at ACPI level and according to the following reversed engineered process:īrightness keys operation is handled through BRT6 method. Unless I'm mistaken (happy to be corrected if required), the SSDT patch was derived from the DSDT patch by Lo and provided in various threads of his that I can't specifically remember. The brightness keys patch for many -if not most- Dell laptops since, at least, Ivy Bridge generations can be applied through DSDT patching or through pure SSDT patching.Ī DSDT patch for E6230 was 1st mentioned at OSXL by our old Dr Hurt's VoodooPS2Controller kext thread the work derived from Rehabman's research and publications. I found that the patch was fully reusable on other models of the E Series and I fully detailed the DSDT patch code in my E6230, E7250 or 7490 guides. Among others, Rehabman did some extensive research work on this several years go and provided substantial information and debugging material to work out fixes. ![]() It's still a recurring topic on the fourm, understandably so, so I thought I'd write a little recap about it.īrightness keys patch has been subject to discussion and queries for many years and much has been written on the matter.
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